. 2015 Mar 31;17(3):e85. doi: 10.2196/jmir.3554
©Sandra Schlegl, Carolina Bürger, Luise Schmidt, Nirmal Herbst, Ulrich Voderholzer. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 31.03.2015.
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Figure 1.
PRISMA flow chart of the literature search.